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* Sub[[urban farming]] & gardening: Best case, how much of the world's food could it produce? | * Sub[[urban farming]] & gardening: Best case, how much of the world's food could it produce? | ||
* How much [[fertilizer]] is fundamentally needed, to achieve high [[crop yields]] on a global scale? | * How much [[fertilizer]] is fundamentally needed, to achieve high [[crop yields]] on a global scale? | ||
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